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In the late 1800s,Louis Pasteur was searching for a vaccine for anthrax in livestock.One French veterinarian had a local reputation for being able to cure anthrax by applying oils and wrapping the animal in cloth to induce a fever.Pasteur also knew that some animals got well on their own when left untreated.Pasteur tested the effectiveness of the local veterinarian's methods by injecting four cattle with anthrax bacteria.He then directed the veterinarian to perform his procedures on two cattle.The other two cattle were left alone.What is the rationale for Pasteur's experimental design?
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